My dad 49YO feels his stomach is  bloated from past 15 days. His stomach size has also increased & all his pants which were lose have become very tight now. It started after he had fasted half day for a ritual. If he walks for about 2km he gets many burps & after that his bloating comes down. He also feels breathless while walking whenever bloating is therr. What is the reason for bloating ? How to cure it permanently?